Question

我有一些具有这种结构的领域数据：

time.Time

我想从部门中选择一些成员并添加到选定的会议中。

public class Member extends RealmObject {

@PrimaryKey
private int id;
private String name;
private String image_url;
}

public class Department extends RealmObject {

@PrimaryKey
private int id;
// some another fields...
private RealmList<Member> members;
}

public class Meeting extends RealmObject {

@PrimaryKey
private int id;
private String title = "";
private RealmList<Member> members = new RealmList<>();
}

下一个Java代码：

//properties
int departmentId = 1;
int meetingId = 4;
Meeting meeting;
Department department;
Realm realm;

//declaration
realm = Realm.getDefaultInstance();
realm.beginTransaction();
meeting = realm.where(Meeting.class).equalTo("id", meetingId).findFirst();

department = realm.where(Department.class).equalTo("id", departmentId).findFirst();

//add members
for (Member member : department.getMembers()) {
    if (!thereIsInList(member,meeting.getMembers()))
        meeting.getMembers().add(member);
}

//realm update and close
realm.insertOrUpdate(meeting);
realm.commitTransaction();
realm.close();

但是我看到新成员与会议无关。请帮我找出问题所在

Answer 1

首先在realm studio中检查您要查找的ID是否正确，并且所需的列表是否存在于与相应ID相关的Realm中。下面的代码段处理了真实的交易

    Realm realmObj;

    //declaration
    realmObj= Realm.getDefaultInstance();

realmObj.executeTransaction(realm -> {
    meeting = realm.where(Meeting.class).equalTo("id", meetingId).findFirst();

    department = realm.where(Department.class).equalTo("id", departmentId).findFirst();

    //add members
    for (Member member : department.getMembers()) {
        if (!thereIsInList(member,meeting.getMembers()))
            meeting.getMembers().add(member);
    }

  });

为什么RealmList与RealmObject不相关？

1 个答案: